Take packing tape. It’s useful for getting lint off your fancy duds and holding your luggage together after you bought too much. Take a lot of duct tape just in case a barge hits the ship or your ship hits an iceberg or if you end up in the perfect storm. You can fashion a life raft out of a few lounge chairs and life vests and duct tape makes a great insulator. It’s also useful in holding down the hairdryer button.